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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Measurements of Asset and Liability Instruments
The carrying amounts of derivative instruments and environmental credit obligations at June 30, 2025 and December 31, 2024 were as follows:
Fair Value by Input Level
Carrying AmountLevel 1Level 2Level 3
(In millions)
June 30, 2025
Assets:
NYMEX futures contracts$$$— $— 
Commodity forward contracts— — 
Total assets$$$$— 
Liabilities:
Commodity forward contracts$$— $$— 
Foreign currency forward contracts10 — 10 — 
Environmental credit obligations103 — 103 — 
Total liabilities$114 $— $114 $— 
Fair Value by Input Level
Carrying AmountLevel 1Level 2Level 3
(In millions)
December 31, 2024
Assets:
Commodity forward contracts$$— $$— 
Foreign currency forward contracts18 — 18 — 
Total assets$19 $— $19 $— 
Liabilities:
NYMEX futures contracts$$$— $— 
Commodity forward contracts— — 
Environmental credit obligations10 — 10 — 
Total liabilities$12 $$11 $—